Accretion definition, an increase by natural growth or by gradual external addition; growth in size or extent. See more.
Alveoli are tiny sacs within our lungs that allow oxygen and carbon dioxide to move between the lungs and bloodstream. Learn more about how they function and quiz your knowledge at the end.
The main function of the alveoli is for exchange of gases. The alveoli remove the carbon dioxide from the blood in the capillaries and exchange it with oxygen to be taken to o â¦ ther parts of the body.